diff --git a/pkgbuild.sh b/pkgbuild.sh
index 4ad7af2..99e5fea 100755
--- a/pkgbuild.sh
+++ b/pkgbuild.sh
@@ -50,6 +50,8 @@ importPrivateKey() {
 }
 
 buildPackage() {
+    pacman -S --noconfirm pacman-contrib
+    sudo -Hu calbuilder updpkgsums
     if [ -n "$gpgPrivateKey" ] && [ -n "$gpgPublicKey" ]; then
         importPrivateKey
         sudo -Hu calbuilder makepkg -s --sign --key "$gpgPublicKey" --noconfirm